I'm a registered Libertarian (lol) who isn't against reigning in ICOs. My chief concern is regulation creep from problems that do exist, to problems that may exist in the future, but aren't really a current concern. I find targeting the latter gives a government a whole lot of elbow room to extract wealth, via things like trade license fees, ICO officiation fees, a requirement that a coin some some property that creates a weak binding with a given fiat currency, etc.

It is worth noting though, that ICOs are primarily a problem because there are a lot of hungry investors looking to 100x their returns, and don't have the tech background required to dissect a whitepaper. Protecting the gullible and uninformed from the manipulative is one of hardest tasks of any society, and the fight is never ending.